parent
8f4bb2540d
commit
cd9ffc12a9
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import javax.swing.*;
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import java.awt.*;
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import java.awt.datatransfer.Clipboard;
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import java.awt.datatransfer.StringSelection;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.util.ArrayList;
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public class CalculatorGUI extends JFrame implements ActionListener {
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private JTextArea displayArea;
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private JTextField inputField;
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private ArrayList<String> history;
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private JTextArea historyArea;
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public CalculatorGUI() {
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history = new ArrayList<>();
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// Set up the frame
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setTitle("Calculator");
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setSize(400, 500);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setLayout(new BorderLayout());
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// Display area
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JPanel displayPanel = new JPanel(new GridLayout(1, 2));
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inputField = new JTextField();
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inputField.setEditable(false);
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displayPanel.add(inputField);
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historyArea = new JTextArea();
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JScrollPane scrollPane = new JScrollPane(historyArea);
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displayPanel.add(scrollPane);
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add(displayPanel, BorderLayout.NORTH);
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// Buttons
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JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
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String[] buttonLabels = {"7", "8", "9", "/",
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"4", "5", "6", "*",
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"1", "2", "3", "-",
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"C", "0", "=", "+"};
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for (String label : buttonLabels) {
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JButton button = new JButton(label);
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button.addActionListener(this);
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buttonPanel.add(button);
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}
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add(buttonPanel, BorderLayout.CENTER);
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// Save, Copy, Clear buttons
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JPanel controlPanel = new JPanel(new FlowLayout());
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JButton saveButton = new JButton("Save");
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saveButton.addActionListener(new SaveListener());
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JButton copyButton = new JButton("Copy");
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copyButton.addActionListener(new CopyListener());
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JButton clearButton = new JButton("Clear");
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clearButton.addActionListener(new ClearListener());
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controlPanel.add(saveButton);
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controlPanel.add(copyButton);
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controlPanel.add(clearButton);
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add(controlPanel, BorderLayout.SOUTH);
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setVisible(true);
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}
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@Override
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public void actionPerformed(ActionEvent e) {
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String command = e.getActionCommand();
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switch (command) {
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case "C":
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inputField.setText("");
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break;
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case "=":
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calculate();
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break;
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default:
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inputField.setText(inputField.getText() + command);
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}
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}
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private void calculate() {
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String expression = inputField.getText();
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try {
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String result = String.valueOf(eval(expression));
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history.add(expression + " = " + result);
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displayHistory();
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inputField.setText(result);
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} catch (NumberFormatException | ArithmeticException e) {
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inputField.setText("Error");
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}
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}
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private double eval(String expression) {
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return new Object() {
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int pos = -1, ch;
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void nextChar() {
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ch = (++pos < expression.length()) ? expression.charAt(pos) : -1;
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}
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boolean eat(int charToEat) {
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while (ch == ' ') nextChar();
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if (ch == charToEat) {
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nextChar();
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return true;
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}
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return false;
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}
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double parse() {
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nextChar();
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double x = parseExpression();
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if (pos < expression.length()) throw new RuntimeException("Unexpected: " + (char) ch);
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return x;
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}
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double parseExpression() {
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double x = parseTerm();
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for (; ; ) {
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if (eat('+')) x += parseTerm(); // Addition
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else if (eat('-')) x -= parseTerm(); // Subtraction
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else return x;
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}
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}
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double parseTerm() {
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double x = parseFactor();
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for (; ; ) {
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if (eat('*')) x *= parseFactor(); // Multiplication
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else if (eat('/')) x /= parseFactor(); // Division
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else return x;
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}
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}
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double parseFactor() {
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if (eat('+')) return parseFactor(); // Unary plus
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if (eat('-')) return -parseFactor(); // Unary minus
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double x;
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int startPos = this.pos;
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if (eat('(')) { // Parentheses
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x = parseExpression();
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eat(')');
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} else if ((ch >= '0' && ch <= '9') || ch == '.') { // Numbers
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while ((ch >= '0' && ch <= '9') || ch == '.') nextChar();
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x = Double.parseDouble(expression.substring(startPos, this.pos));
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} else {
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throw new RuntimeException("Unexpected: " + (char) ch);
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}
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return x;
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}
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}.parse();
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}
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private void displayHistory() {
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StringBuilder sb = new StringBuilder();
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for (String entry : history) {
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sb.append(entry).append("\n");
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}
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historyArea.setText(sb.toString());
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}
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private class SaveListener implements ActionListener {
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@Override
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public void actionPerformed(ActionEvent e) {
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try {
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File file = new File("calculator_history.txt");
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FileWriter writer = new FileWriter(file);
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for (String entry : history) {
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writer.write(entry + "\n");
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}
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writer.close();
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JOptionPane.showMessageDialog(CalculatorGUI.this, "History saved successfully");
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} catch (IOException ex) {
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ex.printStackTrace();
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JOptionPane.showMessageDialog(CalculatorGUI.this, "Error saving history");
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}
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}
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}
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private class CopyListener implements ActionListener {
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@Override
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public void actionPerformed(ActionEvent e) {
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String selectedText = historyArea.getSelectedText();
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if (selectedText != null) {
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StringSelection selection = new StringSelection(selectedText);
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Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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clipboard.setContents(selection, null);
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}
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}
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}
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private class ClearListener implements ActionListener {
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@Override
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public void actionPerformed(ActionEvent e) {
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history.clear();
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historyArea.setText("");
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}
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}
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public static void main(String[] args) {
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new CalculatorGUI();
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}
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}
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@ -1,167 +0,0 @@
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import javax.swing.*;
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import java.awt.*;
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import java.awt.datatransfer.Clipboard;
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import java.awt.datatransfer.StringSelection;
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import java.awt.event.*;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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public class C1 extends JFrame implements ActionListener {
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private JTextField displayField;
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private JTextArea historyArea;
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private List<String> historyList;
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private double num1, num2;
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private String operator;
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public C1() {
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super("Calculator");
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historyList = new ArrayList<>();
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// 设置布局
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setLayout(new BorderLayout());
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// 显示区域
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JPanel displayPanel = new JPanel(new GridLayout(1, 2));
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displayField = new JTextField();
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displayField.setEditable(false);
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historyArea = new JTextArea();
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historyArea.setEditable(false);
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JScrollPane historyScrollPane = new JScrollPane(historyArea);
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displayPanel.add(displayField);
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displayPanel.add(historyScrollPane);
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add(displayPanel, BorderLayout.NORTH);
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// 按钮区域
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JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
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String[] buttonLabels = {
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"7", "8", "9", "/",
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"4", "5", "6", "*",
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"1", "2", "3", "-",
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"0", ".", "=", "+"
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};
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for (String label : buttonLabels) {
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JButton button = new JButton(label);
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button.addActionListener(this);
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buttonPanel.add(button);
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}
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JButton saveButton = new JButton("保存");
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saveButton.addActionListener(this);
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JButton copyButton = new JButton("复制");
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copyButton.addActionListener(this);
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JButton clearButton = new JButton("清除");
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clearButton.addActionListener(this);
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buttonPanel.add(saveButton);
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buttonPanel.add(copyButton);
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buttonPanel.add(clearButton);
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add(buttonPanel, BorderLayout.CENTER);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setSize(300, 400);
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setVisible(true);
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}
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@Override
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public void actionPerformed(ActionEvent e) {
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String command = e.getActionCommand();
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if (command.equals("保存")) {
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saveHistoryToFile();
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} else if (command.equals("复制")) {
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copyToClipboard();
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} else if (command.equals("清除")) {
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clearHistory();
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} else if (Character.isDigit(command.charAt(0)) || command.equals(".")) {
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displayField.setText(displayField.getText() + command);
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} else if (command.equals("=")) {
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calculate();
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} else {
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// 运算符
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num1 = Double.parseDouble(displayField.getText());
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operator = command;
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displayField.setText("");
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}
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}
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private void calculate() {
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num2 = Double.parseDouble(displayField.getText());
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double result = 0;
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switch (operator) {
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case "+":
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result = num1 + num2;
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break;
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case "-":
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result = num1 - num2;
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break;
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case "*":
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result = num1 * num2;
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break;
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case "/":
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if (num2 != 0) {
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result = num1 / num2;
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} else {
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displayField.setText("Error");
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return;
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}
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break;
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}
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displayField.setText(Double.toString(result));
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String historyEntry = num1 + " " + operator + " " + num2 + " = " + result;
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historyList.add(historyEntry);
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updateHistoryArea();
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}
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private void updateHistoryArea() {
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historyArea.setText("");
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for (String entry : historyList) {
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historyArea.append(entry + "\n");
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}
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}
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private void saveHistoryToFile() {
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JFileChooser fileChooser = new JFileChooser();
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int result = fileChooser.showSaveDialog(this);
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if (result == JFileChooser.APPROVE_OPTION) {
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File file = fileChooser.getSelectedFile();
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try (FileWriter writer = new FileWriter(file)) {
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for (String entry : historyList) {
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writer.write(entry + "\n");
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}
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writer.flush();
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JOptionPane.showMessageDialog(this, "保存成功");
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} catch (IOException e) {
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JOptionPane.showMessageDialog(this, "保存失败: " + e.getMessage());
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}
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}
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}
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private void copyToClipboard() {
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String selectedText = historyArea.getSelectedText();
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if (selectedText != null && !selectedText.isEmpty()) {
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Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
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clipboard.setContents(new StringSelection(selectedText), null);
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}
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}
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private void clearHistory() {
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historyList.clear();
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updateHistoryArea();
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(() -> new C1());
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}
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}
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